package com.ruoyi.framework.config;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.sql.DataSource;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.alibaba.druid.spring.boot.autoconfigure.properties.DruidStatProperties;
import com.alibaba.druid.util.Utils;
import com.ruoyi.common.utils.spring.SpringUtils;
import com.ruoyi.framework.aspectj.lang.enums.DataSourceType;
import com.ruoyi.framework.config.properties.DruidProperties;
import com.ruoyi.framework.datasource.DynamicDataSource;

/**
 * druid 配置多数据源
 *
 * @author ruoyi
 */
@Configuration
public class DruidConfig {

  @Bean
  @ConfigurationProperties("spring.datasource.druid.master")
  public DataSource masterDataSource(DruidProperties druidProperties) {
    DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
    return druidProperties.dataSource(dataSource);
  }

  @Bean
  @ConfigurationProperties("spring.datasource.druid.slave")
  @ConditionalOnProperty(prefix = "spring.datasource.druid.slave", name = "enabled", havingValue = "true")
  public DataSource slaveDataSource(DruidProperties druidProperties) {
    DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
    return druidProperties.dataSource(dataSource);
  }

  @Bean(name = "dynamicDataSource")
  @Primary
  public DynamicDataSource dataSource(DataSource masterDataSource) {
    Map<Object, Object> targetDataSources = new HashMap<>();
    targetDataSources.put(DataSourceType.MASTER.name(), masterDataSource);
    setDataSource(targetDataSources, DataSourceType.SLAVE.name(), "slaveDataSource");
    return new DynamicDataSource(masterDataSource, targetDataSources);
  }

  /**
   * 设置数据源
   *
   * @param targetDataSources 备选数据源集合
   * @param sourceName        数据源名称
   * @param beanName          bean名称
   */
  public void setDataSource(Map<Object, Object> targetDataSources, String sourceName, String beanName) {
    try {
      DataSource dataSource = SpringUtils.getBean(beanName);
      targetDataSources.put(sourceName, dataSource);
    } catch (Exception e) {
    }
  }

  /**
   * 去除监控页面底部的广告
   */
  @SuppressWarnings({"rawtypes", "unchecked"})
  @Bean
  @ConditionalOnProperty(name = "spring.datasource.druid.statViewServlet.enabled", havingValue = "true")
  public FilterRegistrationBean removeDruidFilterRegistrationBean(DruidStatProperties properties) {
    // 获取web监控页面的参数
    DruidStatProperties.StatViewServlet config = properties.getStatViewServlet();
    // 提取common.js的配置路径
    String pattern = config.getUrlPattern() != null ? config.getUrlPattern() : "/druid/*";
    String commonJsPattern = pattern.replaceAll("\\*", "js/common.js");
    final String filePath = "support/http/resources/js/common.js";
    // 创建filter进行过滤
    Filter filter = new Filter() {
      @Override
      public void init(javax.servlet.FilterConfig filterConfig) throws ServletException {
      }

      @Override
      public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
          throws IOException, ServletException {
        chain.doFilter(request, response);
        // 重置缓冲区，响应头不会被重置
        response.resetBuffer();
        // 获取common.js
        String text = Utils.readFromResource(filePath);
        // 正则替换banner, 除去底部的广告信息
        text = text.replaceAll("<a.*?banner\"></a><br/>", "");
        text = text.replaceAll("powered.*?shrek.wang</a>", "");
        response.getWriter().write(text);
      }

      @Override
      public void destroy() {
      }
    };
    FilterRegistrationBean registrationBean = new FilterRegistrationBean();
    registrationBean.setFilter(filter);
    registrationBean.addUrlPatterns(commonJsPattern);
    return registrationBean;
  }
}
